2 156 507 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 1 known prime factor. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
195728287498721541638201	24	77.4	2018-08-03 22:59:24

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	165 / 640

Estimated T-Level: 26.3 ⓘ

TF below 2^82 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		John Lyon	3F97210DF38ED695	0
Verified (Factored)	1999-02-14	Lon Green	3F97210DF38ED695	305728
Verified (Factored)	2018-04-10	kkmrkkblmbrbk	3F97210DF38ED695	536246

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2018-08-07	Oliver Kruse	470C31F9D82C9CB0	1	899503	5	3
Verified	2018-08-08	trebor	470C31F9D82C9CB0	1	860728	5	3

History

Date	User	Type	Result
2023-05-13	This -Anonymous-	NF-PM1	B1=800000, B2=40000000, E=12
2018-08-08	trebor	C-PRP	M2156507/195728287498721541638201 : 470C31F9D82C9CB0 PRP: Verified PRP without proof (not generated)
2018-08-07	Oliver Kruse	C-PRP	M2156507/195728287498721541638201 : 470C31F9D82C9CB0 PRP: Verified PRP without proof (not generated)
2018-08-03	bam	F-ECM	Factor: 195728287498721541638201 / (ECM curve 1, B1=50000, B2=5000000)
2018-04-10	kkmrkkblmbrbk	C-LL	3F97210DF38ED695
2017-09-19	Joss	NF-PM1	B1=576000, B2=5760000, E=6
2017-09-13	Joss	NF-PM1	B1=480000, B2=4800000, E=6
2016-11-03	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-04-15	Joss	NF-PM1	B1=240000, B2=8843447, E=12
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2015-12-30	ramgeis	NF	no factor from 2^65 to 2^66
2015-03-22	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-03-22	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-10-03	Joss	NF-PM1	B1=149763
2013-09-08	ramgeis	NF	no factor from 2^62 to 2^63
2011-01-24	markr	NF-PM1	B1=120000, B2=2340000, E=6
2010-11-10	Joss	NF-PM1	B1=60000
2010-11-07	Joss	NF-PM1	B1=45000
2010-11-06	Joss	NF-PM1	B1=30000
2010-11-04	Joss	NF-PM1	B1=15000
2009-01-06	Sturle Sunde	NF	no factor from 2^61 to 2^62
2009-01-04	Sturle Sunde	NF	no factor from 2^60 to 2^61

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